2013
DOI: 10.1371/journal.pone.0074180
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Population Genetics of the Eastern Hellbender (Cryptobranchus alleganiensis alleganiensis) across Multiple Spatial Scales

Abstract: Conservation genetics is a powerful tool to assess the population structure of species and provides a framework for informing management of freshwater ecosystems. As lotic habitats become fragmented, the need to assess gene flow for species of conservation management becomes a priority. The eastern hellbender (Cryptobranchus alleganiensis alleganiensis) is a large, fully aquatic paedamorphic salamander. Many populations are experiencing declines throughout their geographic range, yet the genetic ramifications … Show more

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Cited by 21 publications
(20 citation statements)
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References 77 publications
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“…populations. For instance, in a riparian or riverine species, it could make sense to measure the physical distance along rivers to other populations (McCartneyMelstad et al 2012;Unger et al 2013). More generally, areas in the landscape that are relatively more or less hospitable to a particular species can be categorized as minimally or highly resistive to movement, respectively (Zeller et al 2012).…”
Section: Methods and Their Application To Amphibiansmentioning
confidence: 99%
“…populations. For instance, in a riparian or riverine species, it could make sense to measure the physical distance along rivers to other populations (McCartneyMelstad et al 2012;Unger et al 2013). More generally, areas in the landscape that are relatively more or less hospitable to a particular species can be categorized as minimally or highly resistive to movement, respectively (Zeller et al 2012).…”
Section: Methods and Their Application To Amphibiansmentioning
confidence: 99%
“…This pattern was evident in our explorations of population structure and general summary statistics (i.e., F ST ), as well as results from simple Mantel tests, which indicated a correlation between geographic and genetic distance across the study system. Species restricted to a continuously connected dendritic network generally are expected to follow this pattern [e.g., the Stream Hierarchy Model (Meffe & Vrijenhoek, 1988)], and population genetic studies in fully aquatic salamander species have consistently followed this expectation, including investigations of Cope's giant salamander, Dicamptodon copei (Dicamptodontidae; Steele, Baumsteiger, & Storfer, 2009), and the hellbender, Cryptobranchus alleganiensis (Cryptobranchidae; Unger, Rhodes, Sutton, & Williams, 2013). Necturus maculosus may have the ability to disperse long distances; it can inhabit a variety of habitats (Petranka, 1998) and is suggested to exhibit seasonal migration (Matson, 1998).…”
Section: N Maculosusmentioning
confidence: 99%
“…Desmognathine salamanders are small salamanders that rely on cutaneous respiration as juveniles and adults (Petranka 2010) and our results indicate limited dispersal along both within and out-of-network pathways. Other stream-associated salamanders with larger body sizes (e.g., Cryptobranchus alleganiensis; Unger et al 2013) or that maintain external gills as juveniles and adults (e.g., Dicamptodon copei; Steele et al 2009), exhibited reduced genetic population structuring (F st , 0.001-0.281) and conformed more closely to a stream hierarchy model when compared to D. fuscus, suggesting that larger size or external gills, or both may constrain dispersal to the stream corridor but allow greater movement within these corridors. The limiting role of external gills is also supported by genetic population structure of D. tenebrosis, a species of giant salamander that can exhibit a biphasic life cycle with a distinct, terrestrial adult stage and that exhibits no significant isolation between neighboring watersheds, unlike its predominately paedomorphic conspecific (D. copei; Steele et al 2009).…”
Section: Discussionmentioning
confidence: 99%